That the one that you can set up anywhere you feel the need for a little extra airflow? I think I've looked at it a couple of times and thought it would be a good idea to have around for folks without active chipset cooling.

1. protect the harnesses from the sharp edges that were created when you drilled the mobo back panel; with time, the harnesses will chafe and wires will be cut.
2. raise that reservoir higher than the pump, making sure that the pump is always fed. I use the bracketry that came with the res to attach it to the case back panel. Just one screw is enough.